<style>
  .container{
    background:lightblue;
  }
  .plus,.cross{
    font-size:30px;
    cursor:pointer;
  }
  .plus{
    color:green;

  }
  .cross{
    color:red;
  }

  input{
    font-size:20px;
  }
</style>
<script type="text/javascript" src="jquery-1.10.1.min.js"></script>

<script type="text/javascript">
  jQuery(document).ready(function(){

    $('.plus').on('click',function(){
      var oElem = $('.abstract:first').clone();
      //console.log(oElem);
      $('.container').append(oElem);
    });


  });
</script>

<div class="container">
  <div class="abstract">
    <input type="text" name="" value="" id="" />
    <span class="cross">(X)</span>
    <span class="plus">(+)</span>
  </div>
</div>
